Jar-closure.



N0. 762,799. v PATENTED JUNE14, 1904. W. E. BOSTWIGK.

JAR GLOSURE. APPLIoATloN FILED JULYy 1s, 190s.

Affamey -erated to permit the air to enter theerative position thereon.

l UNITED vSTATES Patented June 14, 1904.

.PATENT OFFICE.

JAFPCLQSURE.

Y SPECIFICATION forming'part of Letters Patent No. 762,799, dated June 14, 1904. Application filed July 18, 1903. Serial No. 166,118.y (No model.)

To all whom t may concern:

Be it known that I, WALTER E. BosTWIoK, a citizen of the United States, residing at Algonac, in the county of St. Clair and State of Michigan, have invented new and useful Improvements in Jar-Closures, of which the following is a speciiication. i

My 1nvent1on has relation to new and useful improvements in jar-closures; and the primary object of the' invention is to provide a closure which is extremely simple in construction, which will securely seal the mouth of the jar, and which may readily and easily be removed from its operative position.

The invention consists in providing a jar of any well-known form with a cap which is adapted to be held in position on the jar by means of air-pressure and which is so constructed as to 4permit the production of apartial vacuum within the vjar after said cap has been placed in position. provided with a removable means whereby 'the ingress of air into the jar may be prevented until such time as it may be desired to remove the cap, when said means may be opjar, so that the cap may be removed.'

I have fully and clearly illustrated my invention in-the accompanying drawings, where'-VV Figure 1 isaverti'cal central section through a jar and my improved closure applied in op- Fig. 2 is atop plan view of the cap. Fig. 3 is a view in elevation of 'an additional securing device for the closure. Fig. 4 is a detail transverse section of a portion of the closure, showing the securing device in cross-section and the manner in which said device engages the cap. Fig. 5 is a view of the metallic disk which is employed for the purpose of holding the flexible disk and protecting the same when the jar is sealed. Fig. 6 is a view of the exible disk for closing the opening in the cover; and Fig. 7 is a transverse section through a portion of a closure, showing a modified 'form of means for holding the flexible disk in position.

Referring to the drawings, l designates a jar in connection with which my improved The jar-cap is alsolprovided with an annular flange or shoulder '2, upon' the upper face of which is disposed a sealing-ring 3, of rubber or other suitable material, said ring being of the usual form employed in sealing fruit-jars and other similar receptacles.

4t designates a circular cap or cover constituting the closure, which is adapted to be placed over the mouth of the jar, said cap being of suiiicient superficial area to extend lbeyondthe upper edge of the jar. At its edge portion thisl cover is lformed withv an annular depending Ylange 5, which when the cover is in position surrounds the mouth of the jar and rests with its lower edge upon the packing-ring 3,V which is supported on 'the flange on the jar.

In the center of the cover 4. is formed an aperture 6, which opens into the interior of the jar-or' vessel, as shown in Fig. l of the drawings. This aperture is provided for the purpose of affording an exit through said cover by means of which the air may be exhausted from the jar and the cover conse- `quently be retained in position thereon by atmospheric pressure. The air may be exhausted by any suitable pump or exhauster, which will satisfactorily accomplish the purpose.

After the airhas been withdrawn from the jar or vessel a disk 7, of any suitable flexible material, is placed over the aperture 6, said disk serving to close the said aperture to prevent entrance of air to the jar after the partial vacuum has been created therein.v This disk will be held in position by means of atmospheric pressure, but may readilyfbe removed when it is desired to release the jarcover, which is accomplished by simply removing the disk from the aperture, which will permit the air to enter the jar, which, equaljar-cover transversely thereof and to vengage the disk 7, the terminals of said bail being bent inwardly, as at 9, which terminals are adapted to assume a position beneath the flange 2 of the jar in order that the said cover may be securely clamped in position and the disk be held in positive engagement with the cover. In order that the clamping-bail will be held against displacement from its operative position, the upper face of the cover is provided with vertical lugs 10 10, which are formed with central channels or grooves 11 11, the channels of said lugs being in alinement with eachother and adapted to receive the bail 8, as shown in Figs. 1 and 4.

As affording an additional means for preventing the ingress of air through the aperture and for protection of the disk 7 I provide a metallic disk 12which is adapted to be arranged upon the upper face of the disk 7 and hold it fiat upon the top of the cover. rlhis metallic disk is provided with a projection 13 upon its under face, which is arranged to press a portion of the flexible disk into the opening 6, as shown in Fig. l.

The cap or closure is affixed in position to close the mouth of the jar by first arranging the packing-ring 3 upon the shoulder 2. The

cap is then placed in position on the jar with the iiange 5 resting on the said packing-ring, after which the air is exhausted from the jar through the aperture 6 by means of a suitable pump. After the air has been withdrawn from the jar the disks 7 and 12 are placed in position to close the aperture 6. This being done, the bail is placed over the cap and disks and the jar is securely sealed.

It will be seen that the atmospheric pressure not only serves to hold the disk 7 in position, but also holds the cap down tightly upon the packing-ring 3, whereby a secure and air-tight package is assured, and then the disks 12 and 7 are removed from their position over the aperture 6, permitting the air to enter the jar, which equalizes the pressure on the upperand lower surfaces, so that the cap may be removed.

It is not absolutely necessary that the bail 8 be employed, as any other suitable means might be used to prevent accidental displacement of the disk for closing ,the aperture 6,

and I therefore do not desire to be limited to the exact means shown.

In Fig. 7 I have shown a modified form of sealing means which will eiciently perform the purpose desired-that is, of holding the flexible disk in position. In this view the cap is shown as being provided'with the central aperture 6, about which and concentric therewith are formed annular stepped shoulders 14; 15, upon the lower one of which, 14, the flexible disk 7 is arranged. The disk 7 being in position, a sealing medium 15, such as parafiin or rosin, 'is poured over it, after which the disk 12 is pressed down in the medium and upon the disk 7. The medium 15 is then permitted to cool and harden, which eifectually seals the closure and prevents accidental removal of the disk 7. When it is desired to remove said disk 7, the disk 12 is removed and the medium is then cleaned away from the disk 7, when the latter may be removed and the closure displaced from the jar. f

It will be seen that in the modified form the disk 12 is arranged iiush with the top surface of the cap, which arrangement aids greatly in preventing accidental removal of said disk by it coming into contact with other objects incident to handling and packing.

Having thus fully described the invention, what I claim as new is- 1. In a jar-closure, the combination of a jar, provided with an exterior annular shoulder, a cap arranged to close the mouth of the jar and provided with an annular depending flange adapted to rest upon said shoulder, an aperture in said cap through which the air may be withdrawn from the jar, a iexible disk to close the aperture and be held in position by atmospheric pressure, a rigid disk on said flexible disk formed with a projection to force a portion of the iieXible disk into the aperture and means to hold the rigid disk in position.

2. In a jarclosure, the combination with a jar having an exterior annular shoulder of a cap arranged to close the mouth ofthe jar and provided with an annular depending flange adapted to rest upon said shoulder, an aperture in said cap through which the air may be withdrawn from the jar, a flexible disk to close the aperture, and adapted to be held in position by atmospheric pressure, channeled lugs on the upper surface of the cover, and a bail seated in said channeledv lugs and engaging the disk and having its ends formed to engage under the shoulder on the jar.

3. In a jar-closure, the combination with a jar having an exterior annular shoulder of a cap arranged to close the mouth of the jar and provided with an annular depending ange adapted to rest upon said shoulder, suitable packingbetween said ange and shoulder, an aperture in said cap through which the air may be withdrawn from the jar, a iiexible disk IOO IIO

to close the aperture, a rigid disk on saidflexible disk formed with a projection to press a portion of the flexible disk into said aperture, channeled lugs on the upper face of the cap, and a bail seated in said channeled lugs and engaging the disks, and having its ends formed to engage under the shoulder on the jar.

4. In a jar-closure, the combination of a jar,

a cap arranged to close the mouth of the jar and having an aperture through which the air may be Withdrawn from the jar, a flexible disk to close the aperture and be held in position by atmospheric pressure, and a rigid disk provided with a projection arranged to force a portion of the flexible disk into the opening in the cap.

5. In a jar-closure, the combination of a jar, a cap arranged to close the mouth of the 'jar and having an aperture through which the air may be Withdrawn from the jar, a flexible disk to close the aperture and be held in position by atmospheric pressure, a rigid disk provided With a projection arranged to force a portion of the iiexible disk into the opening in the cap, and means to hold the rigid disk in position.'

In testimony whereof I aix my signature in presence of two Witnesses.

WALTER E. BOSTWICK. i Witnesses:

C. F. STEWART, H. H. FoLKnR'rs. 

